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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3992042a39b08e5da02ca30e34c424951e3edb661e0d81a473b6988f249ba80' 
  AND token = 'PetMPtc3+GdMbt33kP9GpbZ0aoiv6zJEOzAOt0tcYE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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