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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911f0600dc36a9ceab7e6e03fab63767a88ef4801f51cafc925da8280b66543c' 
  AND token = '0rUT2ujWY5l8YN5JgwGMX7w0Fr7gwGxDGmCOx3PMeSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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