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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d09ae08f99f4695c5a3349b37a8480ce6e18da754cf054c963892f9dd258043' 
  AND token = 'rvhuYsQnLAFX7y/qio4aDUz4OEMVShMQ6Gr5YzK8VhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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