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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a731e5d613da2cfbb631cb834d3582d976e9f15b590097234d49f3167b0e1d' 
  AND token = 'Dr250nRUp5KU2Xcw2mPbCyoIhBa30CvSYFhbWC5NMrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}