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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1ec254456c7f7061a0cc30115fe4b1bce40383b5737a1f7824cb480021407f' 
  AND token = 'TEWLgT3ggdl4sfgVluV/xjgas/WyxlwKZZJa/j5gEkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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