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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f6c0dd66aa2d049710c9c7045ec0938a8167724eb6827d6855fcdd4b88fa0e' 
  AND token = '0aJqE/S795GNv95HK3KcCCPVIoG4CCvbgPvcWqohr3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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