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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaca43c9a574f3bff4aba4866eedfe8365cd0e905f82de236782e949659b3734' 
  AND token = 'b0yCPKt0Dz6LUPN+OIctBbaTlYfB7nsVxfWixcadaZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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