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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de07641aeba14f474e50cadc3c9d3c6171d6417f91e358599dff4fdca20a329' 
  AND token = 'zS3qWVGVYtXi5HVWbCf7iEiteV14kiPAn3CpqwHy5UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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