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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c3fb7a330423a129617240ad0b1f2ffd24f7b0905bf2e95429e8a58a15a6cf' 
  AND token = 'RYPZcBjQpfnGxCeaZ2ppmYI1Wf/UofzKtRlU2G8mP5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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