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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fd88da34ade3bedc5479e115241e1b16a22935909d1f7e2c54325c106a6e69' 
  AND token = 'NDMwViN5a1QMu8bZKnjIppLg7vQboeRvKiltiqhwpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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