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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ea64768dcb0c4568a13bb077d56343ba319f531653acda612cca9963efb0af' 
  AND token = 'p6/oW/72w43EAx/SlZNp1O4ob9ojGYbpfYv5sfwGCkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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