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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9358b1a34a394c76d5d3e4a7be1b993b9e6588c93b29256ab346b9bd74c307f3' 
  AND token = 'cQo9r8TmBJtnze3OBP0JGPpleCYYW4z45zvyexc6M3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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