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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da83353f3b10160f4eb0607c881fa588428d49f067bda66a007809c40d6dc5d' 
  AND token = 'E7x6LqasiVET46VPdfnOawOhECK9EaxLNOwXk1rvFrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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