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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33c04b6ace7c21bb909b775caf1e221c92899eeaaf401b4beb42c60b6118d0a' 
  AND token = 'AI6Sld8+IElcVyAbsKow5SFUEEOEYnEAkwyN3pmRSV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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