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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6894e9e8f48769f4064afd196001e6526685aff0789121fa38859f8fe2da272c' 
  AND token = '+GdO4q5trVmdbU18nCKJMc4qOB1bmhmGWzVOlNT+bkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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