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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d22777190a114538a25dbfe848b418dd2df349144e6e891d53fa67c6e0808a7' 
  AND token = 'pHZo2VzMUc2aCO9iYOyeLnXEB1vI8z3TtcCxm2APTJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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