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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baae9eb2addc0cf7383baaba06c20149e90134683c5730271e9c049f27236dbf' 
  AND token = 'Qmm+4ZCuh3fAdfrHICAFU+1Ab61sZo03y6rVlNPZDKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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