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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a448a0f1c9ba8d9cfdc8af22981142628993ee2730901bc18b34c3ee5e38224' 
  AND token = 'QvUPzejaweeEeXBP/c58fVz2r8TqY9GaEqwvF++DOVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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