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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efc4bb57dca5296bfbcd7b8d82083d894a8c5aef7b4049b9ad757cc1c1c821c' 
  AND token = 'kn9F33pyJnHDGRBUbfF2x0LXIE4yCJnLbTnaf4iUwgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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