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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9771f4d46b52b84a3d0c3b969d58095d63f80629610c0ae01a161a66e236803' 
  AND token = 'gyXSC0g88IG4tvyea2fUEMy3Fq7U+Z41K1/JiH875x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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