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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d1f433da6cb37dc15c0079534c8d31496f686a05dc1056e3662515ee582fe7' 
  AND token = 'cV1maL3PR9xP5ccO9v+Qwcd1oK4pPdjTO8uVQ9/nduc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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