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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d5ae945f3ba1fef9bd0ad05cbc5e2ceb3b061e99518ab3c715cf126282d924' 
  AND token = '3AiXF+4/pYWjbhGqCNlS/95MFaO8UNcVMRYQh5uFVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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