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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb993285e0c637e0778a1b92cf41b4715b6fd2d4fef260c56c5e619f454baf5' 
  AND token = 'mIybYLXjfpiA85tEBq1cD0ln70E/pgjyzKW7acK+nvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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