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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a946045baed4c43844f014b05b40f145477b0762e6a178bb3156a0cc2ec291' 
  AND token = '7KjdG77ojmDXE7uCHnmjtVxZ/FBly7YyymfisXlGpBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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