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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c051393f8a5c1072cc4a0cdb5f348d78896c283440772f584daa53c7d1f76bc' 
  AND token = 'EynfSXjlkTzhdYT6c877C6IDdAgzto7wrc9HVXIEEUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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