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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4fc1b2a6123eea64e1d03a38866772307e218243bc13e1f93563dcbf96e467' 
  AND token = 'ljo3VsSZIU6bcLOt75bAHI2WpkDuqrLErvAAoSv67SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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