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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58205ea25992ed0bced7d385e057e8e655680a0d6defb9f2849e4417f1cf349d' 
  AND token = 'Pn2HaPYz0fq8Y9ZmaRXvNW9utdwLhq141Eoo/jF6+bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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