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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64831bdd0de22e31d4b72afb947d073b66bd1cd4eab5c44c6718209e3d00a0d4' 
  AND token = 'Sx/lxXU3eAptHP12Atqv79nfSng8oF5wLrJ/WFaO/OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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