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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3ae3df9be9e20bc4e092c4929388047e1f603f97e2c01398645434348c2e76' 
  AND token = 'gJ9CpKXMNhvB8JBfA9ttxb1j12G/jocN6yRYFSUUo3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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