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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa46b8a003d4ad207262bb885ba6def5252907fa2b9693e874632d0a794a291b' 
  AND token = 'A21xv6792s97FruukZBUYl9vfSyuyoYQLljsag2VZqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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