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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d57e2685d59e8ff5d895fcd6c6a6e5fcbf7f89d4299361c3f4cfd387ef321a6' 
  AND token = 'j8tFZ2/Q1PhQeZq5xZ02L5B0SZ23HWyEeQwAEx7j9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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