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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39d2f2f40d0a7a09bbd5bbbcb9a1968884b0148aca5b7930ca467a6a0aea158' 
  AND token = '0rLoPEwAMVDXCvbbrGUHpTxP5T9fto/NLeqvqzPCX8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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