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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60ac165b4939eb5ee6fb3e74e2d85c28f4d24136de9fc1da9ed6ed54f7e25b8' 
  AND token = 'iK1wJQmL50MkV1LnyxixuRclPwelW0pJnon8aM6N+6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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