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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cc3ce57221bc00c27d3858620c0f917ee843ad0c9b3027881b1ef0e2421e23' 
  AND token = 'eamkDEicNbiUVN7oXFX0SS0JUqj/DxNnY01CL75YlbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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