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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c5d437e5c2eea8bb50584677cd6d04a9780b845ac98418e4ffe546fc3f87a8' 
  AND token = 'wm2LjCnPPJ67mQYW1Y6ThnWN2ICOhZPwCF5X5lrv+tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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