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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059c24a5aa424c3bc3cbf1a40a71b54b09d37310fd9a96e3ca268026d953de27' 
  AND token = 'AacRzK+69enDxOFspSj0il77jX+jJZwPX365NZqmH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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