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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c76eb1e0515fc262d67f27b4e22d3d715664bd9cc4e869d94fdbe7dc4dbc6ae' 
  AND token = 'uMSHrg85KGu58h9GdJgLLVxR0TlDpzEz8FXOFy0/j4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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