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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885ca6f39e2bfac072463a8ef289ef9fb278491045b995be25934320ee16ce73' 
  AND token = '13C+NyW7ebMOVkTvpQdkbiM5e8H5NWpP6WInYVHIJLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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