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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa585f980c311fd7edd0a87e37aa6871f21864960194a061d2ba0e1e52aad5dc' 
  AND token = 'ou9I1xF4Yay9ElwV3hVG54OM8kmLRMuPIaMg40JuMLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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