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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57df544c68177fee766be3eb10eef5f712504edafa1eda0c766e207369d349f8' 
  AND token = 'AZ89H0J4NwG4blFggNH2eNC2n/WT4RgKkb8eXm0g3WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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