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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e3e1ca77846ad22fcb7d818700fae4425d7b4b05747198a35a0b8248c1cb83' 
  AND token = 'z6JfYnBn/jfcn6NVZ4ch+nUcti5xBMyC7HYdBpRukSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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