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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87fb44b95eed04b4d2d44fdf229a3f25c1b3176377756ddb52cfd109251262b' 
  AND token = 'A4cRMlda+istvmThZNDG4VfVUq6oKmV0G3KwBWA48iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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