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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b2410928562200ffd1c16f6f46f4e08ffc3b6de4747b7e38a04531565833ee' 
  AND token = '0MLFz4+UBrPg57yqi7a6/l1uizTekWVrnaJwtZEAI6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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