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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026432deba24ef0e61079483496f9b407aa61b8f8d2bdabbdbda09b35e770c71' 
  AND token = 'NL5goiOfIxpDKnsCuergvXgIzETNe0o1tcLnh5cWxho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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