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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eb8410ea1c071b17c4b5f1271aa6c774fdb0020813c2c2d30620573ea4ee62' 
  AND token = '4H4aALp5obH0KHME5S9fUZIfM6UiDQGBcmI5Gjwqpo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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