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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074421c16643a8179dc8ba7f0506eccd4cb1394263877eff8580f0084fe8439b' 
  AND token = 'Vk28DPoDZtTRW3mcTIbAaYrgCyTN4pIQ/Kgc75WhCXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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