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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d0639199e68a72954fb0f4756b02a29eb620fe7ffe8fb9d4763fd0de82c5d0' 
  AND token = 'z2RC8IA3L546KuBrXx/7mFBCDISikOoTMUq26bMKFh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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