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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb36717af460a87e1ef7a0030fe0dd4527b230181c63c9419ba43e086d23965' 
  AND token = 'eifXeuw+jUDKjK26W0SdUmbHZEyUOVkXDM65024+5kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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