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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f510ba872d228fe86bc03b7e2c542b36f18613de71cb000ace93a9351cb0968' 
  AND token = 'cwkrZa43pUTEOuuScfYZTbWthQhI6nJmeE+Hj+8Tx80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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