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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b91b92b335517806cbb5190ee7cbf154dc5bc5d66e25523a0a2a580f1db138e' 
  AND token = '7n8nCwf4vdPMDN1o2cgkefioc2XZQqUhOw/FnGg7QDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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