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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9056672222c220c714c123ed35ef2fe0b4820740983d9982f1dee47866bf0de8' 
  AND token = '3icQoyvEGCxn2ebSiUtAb1+uORJvjkKj3ZP9z0OoWT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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