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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e04bd3b1c75c1c1b39d2f0549735654da05eec6041451a5307452509167d8e' 
  AND token = '9m0e2U41iANSjaTplcvwhbEY66urcKCTrECCgWOS/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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