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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82e7955623b5e354049ee242e0f0f89160dc85ba65563106d432827769c00d5' 
  AND token = 'zz5W8tJlWHpjCo1Gqfigrso5nu4BuNl0i2rW6L2tGj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00213

JSON explain

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