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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761a7327fa20b576b46236f2fe5a9c004032effedd4671bb49686ff90b0cd4a1' 
  AND token = 'b8Xez1V1+Ix3mQYWqjqsBxc5CS8u48kcgz37a+BUfLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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