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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764627f260400136a00a90ebbc0298c1df0f820fe768729831a003352a440dd9' 
  AND token = 'OgaczJyxbrX6c4xXRNL2agukprDhEZN5zhk3uYz/rjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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