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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633b26f15a6eb276075149f433f0de1e61f38c55d584547d26c36acfa0849b2c' 
  AND token = 'qHFQhcDQZyu7NmtJCbyA2OcakW7ob+IkgjWmH2rP3Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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