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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d739b3f56e6632e1a84ac8bb9facbea75a76d728c1f6ea87e8bb87fb82646b' 
  AND token = '+WoVPrlLXCt7Y+mD8c+qOFJamiwz5teO+8YaleMpdIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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